Steps to reproduce:

1. Download and import attached project.
2. Open scene: test3_3D_size.
3. Press play.
4. In hierarchy, select "3D size"
5. In inspector, over "Show Size (Script)" component, inspect values.

Expected result: Size on X Y Z should be equal.
Actual result: Only X changes, Y and Z stay still.

Notes: This only happens when "3D Start Size" is in 3D mode, but size over lifetime is not separate axis. One curve for all axis, should change the size equally, and it does (we can see it visually), but GetCurrentSize3D method returns incorrect value.

Notes: The same thing happens with SizeBySpeed.

Reproduced on: 5.5.0a1 June 1, 5.4.0b21